linux-kernel - Re: [PATCH] x86_32, entry: store badsys error code in %eax

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Message-ID: <53CD4BE8.5030603@zytor.com>
Date:	Mon, 21 Jul 2014 10:20:40 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andy Lutomirski <luto@...capital.net>
CC:	Sven Wegener <sven.wegener@...aler.net>,
	Richard Weinberger <richard@....at>, X86 ML <x86@...nel.org>,
	Eric Paris <eparis@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Borislav Petkov <bp@...en8.de>,
	Toralf Förster <toralf.foerster@....de>,
	stable <stable@...r.kernel.org>,
	Roland McGrath <roland@...hat.com>,
	Josh Boyer <jwboyer@...oraproject.org>
Subject: Re: [PATCH] x86_32, entry: store badsys error code in %eax

On 07/21/2014 09:53 AM, Andy Lutomirski wrote:
> On Sun, Jul 20, 2014 at 3:07 PM, H. Peter Anvin <hpa@...or.com> wrote:
>> This is not a subtle regression at all.  It is in fact a very very serious one.
> 
> Indeed.
> 
> Does this really work correctly on sysenter?  It sure looks like the
> sysenter path has the same problem.
> 
> Grr.  I'm not set up to properly test 32-bit kernels.  The patch looks
> correct, but I'm obviously not an infallible authority on "looking
> correct" when it comes to entry_32.S.
> 
> --Andy
> 

KVM is great for that sort of things.

	-hpa


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